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RX J0911+05: A Massive Cluster Lens at z =  0.769

Kneib, Jean-Paul and Cohen, Judith G. and Hjorth, Jens (2000) RX J0911+05: A Massive Cluster Lens at z =  0.769. Astrophysical Journal, 544 (1). L35-L39. ISSN 0004-637X. doi:10.1086/317285.

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We report the detection of a massive high-redshift cluster of galaxies near the quadruple quasar RX J0911+05, using the Low-Resolution Imaging Spectrograph instrument on the Keck II telescope. The cluster is found to have a mean redshift of z = 0.7689 ± 0.002 and a velocity dispersion of σ = 836^(+180)_(-200) km s^(-1), based on redshift measurements for 24 member galaxies. This massive high-redshift cluster is the origin of the unusually large external shear required by lensing models of the quadruple quasar system. We predict the expected time delay depending on the exact contribution of the cluster. A measurement of the time delay and further deep lensing and X-ray observations will unravel useful properties of this serendipitously discovered high-redshift cluster and may put interesting cosmological constraints on H_0.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Kneib, Jean-Paul0000-0002-4616-4989
Cohen, Judith G.0000-0002-8039-4673
Hjorth, Jens0000-0002-4571-2306
Additional Information:© 2000 The American Astronomical Society. Received 2000 June 9; accepted 2000 August 23; published 2000 November 6. Part of the work presented is based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. The entire Keck/LRIS user community owes a huge debt to Jerry Nelson, Gerry Smith, Bev Oke, and many other people who have worked to make the Keck Telescope and LRIS a reality. We are grateful to the W. M. Keck Foundation and particularly its late president, Howard Keck, for the vision to fund the construction of the W. M. Keck Observatory. It is a pleasure to acknowledge the efficient and friendly support of the Keck Observatory staff. We also acknowledge useful discussions with C. Kochanek, F. Courbin, and I. Burud. This research was supported by CNRS/INSU for J.-P. K. and by the Danish Natural Science Research Council (SNF) for J. H.
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Danish Natural Science Research CouncilUNSPECIFIED
Subject Keywords:galaxies: clusters: general—galaxies: clusters: individual (RX J0911.410551)—gravitational lensing
Issue or Number:1
Record Number:CaltechAUTHORS:20190524-132511021
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Official Citation:Jean-Paul Kneib et al 2000 ApJ 544 L35
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95791
Deposited By: Tony Diaz
Deposited On:24 May 2019 20:31
Last Modified:16 Nov 2021 17:15

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